They are barneys farm red cherry berry grown in soil from seed. the are about 15-18 inches tall and five days into 12/12 flowering light. They are being grown under LED grow lights. Adverage temp is 22c and average humidity is 60%. The have a extract fan running constant pulling air through a vent for air flow. Today noticed yellow marks on one of the smaller/bushier plants leaves (see attached pic) the rest seem healthy, what could be causing this?. I have also attached a pic of the taller plants. Do they look healthy to you?
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